When I turn my key on to let the glow plugs cycle I can hear my fuel pump but instead of the constant buzz from it, it cuts in and out. I can also see this on my fuel pressure gauge. It doesn't do it all the time, mainly just when started first thing in the morning. It continues to cut in and out when I begin to drive it but levels out after a few minutes. I have a stock pump. Anybody else ever have this issue? Thanks in advance

I went out this morning and before starting I drained my fuel/water separator. I started the truck and no bouncing of the fuel pressure and no cutting out of the pump. The problem is very intermittent. One thing I did notice is that immediately after starting the FP was 55 and after idling for a minute or so it made it's way up to 60 and leveled out. WTF is going on? Is my pump starting to get weak? It's the original pump and has 135k miles on it.

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